Knee protector



FIG. 1 is a perspective view of a knee protector showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof; the opposite side being a mirror image;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is an end elevational view thereof. 

The ornamental design for a knee protector, as shown and described. 